What Is a Stone (st)?
Definition
Stone (st): A unit of mass used in the United Kingdom for body weight, symbol st. One stone is 14 pounds, which makes it exactly 6.35029318 kilograms.
The stone (symbol st) is a unit of mass used in the United Kingdom, mostly for a person’s body weight. The UK Weights and Measures Act 1985 defines it as 14 pounds. Since a pound is exactly 0.45359237 kg, one stone is exactly 6.35029318 kilograms. Body weight is often written in stones and pounds, as in 11 st 4 lb.
Where it appears in the formulas
1 st = 14 lb = 6.35029318 kg. The weight converter uses this exact value. For example, 11 stone is 154 pounds, or 69.85322498 kg.
Stones and pounds together
To convert a value such as 11 st 4 lb, first turn it all into pounds: multiply the stones by 14 and add the pounds. Then convert the total in pounds to kilograms with the weight converter.